ANATOMY

Detailed explanation-1: -In neurons, K+ ions are maintained at higher concentrations within the cell; however, outside the cell, Na+ ions are present at higher-level concentrations. The cell possesses potassium and sodium leakage channels that allow the two cations to release their concentration gradient.

Detailed explanation-2: -The resting membrane potential of a neuron is about-70 mV (mV=millivolt)-this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron.

Detailed explanation-3: -Cl-is more concentrated outside than inside the cell. Na+ is more concentrated outside than inside the cell.

Detailed explanation-4: -At rest, the membrane is impermeable to Na+, as all of the Na+ channels are closed.